Antistatic styrenic polymer compositions and articles therefrom

Abstract

An antistatic styrenic polymer compositions comprises 30 to 70 wt % of a styrenic polymer, 5 to 40 wt % of a potassium ionomer, 1 to 10 wt % of one or more polyols, and 2 to 20 wt % of an ethylene copolymer, based on the total weight of the styrenic polymer composition which, if compared with compositions of the state of the art, shows reduced dust absorption and improved mechanical performances. Also disclosed are articles made of the composition such as film or sheet including multilayer structure and items obtained by extrusion molding, coextrusion molding, injection molding, thermoform molding, compression molding or blow molding.

1 . A composition comprising an antistatic blend wherein
 the blend comprises or is produced from a styrenic polymer, a potassium ionomer, one or more polyols, and an ethylene copolymer;   the styrenic polymer is present in the composition in the range of about 30 to about 70 weight % of the composition; the potassium ionomer is present about 5 to about 40 wt % of the composition and comprises at least one E/X/Y copolymer; the polyol is present in about 1 to about 10 wt % of the composition and comprises at least three hydroxyl moieties; and the ethylene copolymer is present in the range of about 2 to about 20 wt %;   E is ethylene, X is an α,β-unsaturated C 3 -C 8  carboxylic acid, Y is a softening comonomer including C 1-8  alkyl(meth)acrylate;   X is 2 to 30 wt % of the E/X/Y copolymer, Y is 0 to 40 wt % of the E/X/Y copolymer, and the remainder is E; and   10 to 90% of the carboxylic acid is neutralized with potassium ions.   
     
     
         2 . The composition according to  claim 1  comprising 10 to 20 wt-% of the potassium ionomer. 
     
     
         3 . The composition according to  claim 2  comprising 1 to 5 wt-% of the polyol. 
     
     
         4 . The composition according to  claim 1  comprising 7 to 20 wt-% of the ethylene copolymer including ethylene alkyl(meth)acrylate copolymer. 
     
     
         5 . The composition according to  claim 2  comprising 7 to 20 wt-% of the ethylene copolymer including ethylene alkyl(meth)acrylate copolymer. 
     
     
         6 . The composition according to  claim 3  comprising 7 to 10 wt-% of the ethylene copolymer including ethylene alkyl(meth)acrylate copolymer. 
     
     
         7 . The composition according to  claim 2  wherein the styrenic polymer includes ABS (Acrylonitrile Butadiene Styrene), SAN (Styrene AcryloNitrile copolymer), ASA (acrylonitrile styrene), or combinations of two or more thereof and mixtures thereof. 
     
     
         8 . The composition according to  claim 6  wherein the styrenic polymer is ABS. 
     
     
         9 . The composition according to  claim 1  wherein the polyol includes glycerol, diglycerol, hexanetriol, pentaerythritol, polyglycerol, sorbitol, or combinations of two or more thereof. 
     
     
         10 . The composition according to  claim 8  wherein the polyols is glycerol, diglycerol, or combinations thereof. 
     
     
         11 . The composition according to  claim 4  wherein the ethylene alkyl(meth)acrylate copolymer contains from 20 to 35 wt-% of alkyl(meth)acrylate. 
     
     
         12 . The composition according to  claim 10  wherein the ethylene alkyl(meth)acrylate copolymer contains from 20 to 35 wt-% of alkyl(meth)acrylate. 
     
     
         13 . The composition according to  claim 12  wherein the alkyl group of the ethylene alkyl(meth)acrylate includes methyl, ethyl, n-butyl, or combinations of two or more thereof. 
     
     
         14 . The composition according to  claim 13  wherein the alkyl group is methyl. 
     
     
         15 . An article comprising a composition wherein the article is film, sheet, multilayer structure, shaped article, or combinations of two or more thereof; the shaped article includes articles made by extrusion molding, coextrusion molding, injection molding, thermoform molding, compression molding, blow molding, or combinations of two or more thereof; and the composition is as recited in  claim 1 . 
     
     
         16 . The article according to  claim 15  wherein the styrenic polymer is ABS, the polyol is diglycerol, and the composition comprises from 10 to 20 wt-% of the potassium ionomer. 
     
     
         17 . The article according to  claim 16  wherein the composition further comprises 7 to 20 wt-% of an ethylene alkyl(meth)acrylate copolymer. 
     
     
         18 . The article according to  claim 17  wherein the article is a cosmetic case. 
     
     
         19 . The article according to  claim 17  wherein the article is a part of household appliances. 
     
     
         20 . The article according to  claim 19  wherein the part is housing.